What it means
Each candle covers one time period, which might be a minute, a day or a month depending on the chart. The body of the candle runs between the opening and closing price, and the thin wicks, also called shadows, stretch out to the high and the low of that period.
Colour carries the direction. A candle is usually filled or red when the close is below the open, and hollow or green when the close is above it, so you can scan a year of trading and spot momentum shifts without reading a single number.
Candlestick charts turn up well outside trading desks. They appear in board packs, investor updates and treasury reports whenever someone is discussing a share price, a commodity input or a currency exposure, so if your business buys copper or sells into a foreign market you will see one on the screen.
The shape of a candle is the information. A long body with tiny wicks means one side dominated the whole session, while a short body with long wicks means buyers and sellers pushed hard in both directions and finished roughly where they started.
The important nuance is that candlestick patterns describe what has already happened, not what will happen next. Names such as hammer, doji and engulfing are shorthand for common shapes, and while traders treat them as signals, they carry no guarantee and should never be the only input into a decision involving real money.
In practice
Real-world examples.
Example
A subscription software founder tracks the listed competitor she benchmarks pricing against. She notices three consecutive daily candles with long upper shadows and small bodies, meaning the share was bid up each morning and sold back down each afternoon, and reads it as the market disagreeing with the competitor's new pricing announcement.
Example
An airline treasury team reviews weekly jet fuel candles before extending its hedging programme. A run of tall red bodies with almost no lower shadows tells them the market has been selling steadily rather than testing a floor, so they decide to hedge a smaller proportion of next year's volume and wait.
Example
A manufacturing CFO is asked at a staff briefing why the share price moved so much in one day. He puts up a monthly candlestick chart showing the last three years, points out that the range of the current month is no wider than a dozen earlier ones, and uses it to calm the room without arguing about a single day's number.
Think of it
“Candlestick shows price action in candle shapes-body is open to close, wicks are highs and lows.
Formula
Calculation
The four measurements that define a candle are:
Body = Close - Open (a rising candle if positive, a falling candle if negative)
Upper shadow = High - the higher of Open or Close
Lower shadow = the lower of Open or Close - Low
Total range = High - Low
Take a share that opens a trading day at $42.00, climbs as high as $46.50, dips to $41.20 and closes at $45.80.
Body = $45.80 - $42.00 = $3.80, and because the close beat the open this is a rising candle.
Upper shadow = $46.50 - $45.80 = $0.70.
Lower shadow = $42.00 - $41.20 = $0.80.
Total range = $46.50 - $41.20 = $5.30.
Body as a share of range = $3.80 / $5.30 = 71.7%.
That 71.7% is the useful figure. Almost three quarters of the day's movement was one-directional buying, with only small pushes either side, which is a far stronger picture than a $3.80 gain achieved inside a $12.00 range would have been.Case study
Seen in the real world.
Northbeam Roasters is an illustrative, entirely fictional coffee importer used here to show how a non-financial team reads a candlestick chart. Its buying manager had always worked from a simple line chart of the arabica price, which showed a smooth climb of about 18% over four months and prompted a recommendation to lock in supply immediately.
The finance director asked to see the same period as daily candles. The picture was different: the climb was made up of small green bodies with very long lower shadows, meaning the price fell sharply most days before recovering by the close. That pattern suggested persistent buying support rather than a runaway market, and it also showed that the intraday lows were regularly 4% or 5% below the closing price.
In this illustrative story the team split the purchase, fixing half the volume immediately and placing standing orders near the level the lower shadows kept reaching. Two of those orders filled over the following month. The lesson was not that candlesticks predicted anything, but that the extra two data points per bar showed where the market had actually been willing to trade.
Watch out
Common mistakes.
- Treating a named pattern as a forecast. A hammer or an engulfing candle summarises what buyers and sellers just did, and plenty of them are followed by nothing at all.
- Comparing candles across different time frames without saying so. A one-hour candle and a one-month candle can look identical on screen while describing completely different amounts of trading.
- Ignoring volume. A dramatic candle formed on very thin trading is often just one large order, not a genuine shift in what the market believes the asset is worth.
Questions
People also ask.
What is the difference between a candlestick chart and a bar chart?
Both show the same four prices, but the candlestick fills in the space between the open and the close, which makes direction and conviction much faster to read.
Does the colour convention ever change?
Yes, some platforms use black and white or hollow and filled bodies instead of green and red, and a few invert the colours entirely, so always check the legend before drawing conclusions.
Are candlestick charts useful for anything other than shares?
They work for anything with an open, high, low and close, including commodities, currencies, bonds and cryptocurrency, and they are equally useful for tracking an input cost you buy rather than an asset you own.
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